floats/exp128_test.go at main · shogo82148/floats · GitHub

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package floats

import (
	"math"
	"runtime"
	"testing"
)

func TestFloat128_Exp(t *testing.T) {
	tests := []struct {
		x    Float128
		want string
	}{
		{exact128(-1), "0.3678794411714423215955237701614608674458111310317678345078368016974614957449"},
		{exact128(0), "1"},
		{exact128(1), "2.71828182845904523536028747135266249775724709369995957496696762772407663035355"},
		{exact128(2), "7.38905609893065022723042746057500781318031557055184732408712782252257379607906"},
		{exact128(3), "20.085536923187667740928529654581717896987907838554150144378934229698845878092"},
		{exact128(4), "54.5981500331442390781102612028608784027907370386140687258265939585536620999359"},
	}

	for _, tt := range tests {
		got := tt.x.Exp()
		if !close128(got, tt.want) {
			t.Errorf("Exp(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}

	strictTests := []struct {
		x    Float128
		want Float128
	}{
		// special cases
		{exact128(math.Inf(1)), exact128(math.Inf(1))},
		{exact128(math.Inf(-1)), exact128(0)},
		{exact128(math.NaN()), exact128(math.NaN())},
	}

	for _, tt := range strictTests {
		got := tt.x.Exp()
		if !eq128(got, tt.want) {
			t.Errorf("Exp(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}
}

func TestFloat128_Exp2(t *testing.T) {
	tests := []struct {
		x    Float128
		want string
	}{
		{exact128(-1), "0.5"},
		{exact128(0), "1"},
		{exact128(1), "2"},
		{exact128(1.5), "2.828427124746190097603377448419396157139343750753896146353359822541"},
	}

	for _, tt := range tests {
		got := tt.x.Exp2()
		if !close128(got, tt.want) {
			t.Errorf("Exp2(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}

	strictTests := []struct {
		x    Float128
		want Float128
	}{
		{exact128(16385), exact128(math.Inf(1))},
		{exact128(-16496), exact128(0)},

		// special cases
		{exact128(math.Inf(1)), exact128(math.Inf(1))},
		{exact128(math.Inf(-1)), exact128(0)},
		{exact128(math.NaN()), exact128(math.NaN())},
	}

	for _, tt := range strictTests {
		got := tt.x.Exp2()
		if !eq128(got, tt.want) {
			t.Errorf("Exp2(%v) = %v; want %v", tt.x, got, tt.want)
		}
	}
}

func BenchmarkFloat128_Exp(b *testing.B) {
	x := exact128(1.5)
	for b.Loop() {
		runtime.KeepAlive(x.Exp())
	}
}

func BenchmarkFloat128_Exp2(b *testing.B) {
	x := exact128(1.5)
	for b.Loop() {
		runtime.KeepAlive(x.Exp2())
	}
}